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The delayed warnings experiment should only handle phishing pages. It
doesn't make sense to run it for other threat types, as the goal is to
understand the effect of different URL display modes to phishing
threats.

This CL also fixes a DCHECK when there are multiple unsafe resources in
the current WebContents. The old code assumed that the method to create
the user interaction observer could only be called once per WebContents.
In reality, it's called for each unsafe resource, so this CL ignores
subsequent calls.

Bug: 1057157
Change-Id: Ifb87dae060c2a08c37aeef55835c318ba7bcdfec
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2130626
Commit-Queue: Mustafa Emre Acer <meacer@chromium.org>
Reviewed-by: Varun Khaneja <vakh@chromium.org>
Reviewed-by: Xinghui Lu <xinghuilu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#756470}